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5(7+b)-(b-4)=71
We move all terms to the left:
5(7+b)-(b-4)-(71)=0
We add all the numbers together, and all the variables
5(b+7)-(b-4)-71=0
We multiply parentheses
5b-(b-4)+35-71=0
We get rid of parentheses
5b-b+4+35-71=0
We add all the numbers together, and all the variables
4b-32=0
We move all terms containing b to the left, all other terms to the right
4b=32
b=32/4
b=8
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